I have an HP SAN storage array that has 2 fans on the back. They run at full speed all of the time, and I'd like to slow them down based on the temperature of the hard drives in the array.
The fans don't have any good exterior markings (other then 12V), so in the name of science, I sacrificed one of the pair.
There are 6 wires:
I get that M+ and M- are for power and that TACH is probably to measure the speed of the fan, but any idea what the other 3 are? And based on those connection names, any idea on the right way to control the fan speed?